<template>
  <div>
    <h1>app</h1>
    <!-- <MyCom /> -->
    <MyCom></MyCom>
  </div>
</template>
<script>
import MyCom from './MyCom.vue'
export default {
  components:{
    MyCom
  }
}
</script>

<style scoped>

  h1 {
    color: red;
  }

  div /deep/ button{
    color: blue;
    background-color: green;
  }
</style>